MAXIM MAX2056 User Manual
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General Description
The MAX2056 evaluation kit (EV kit) simplifies evaluation of the MAX2056 general-purpose, high-performance, variable-gain amplifier with analog gain control.
The EV kit is fully assembled and tested at the factory.
Standard 50Ω SMA connectors are included at the
input and output of the EV kit to allow quick and easy
evaluation on the test bench.
This data sheet provides a list of equipment required to
evaluate the device, a straightforward test procedure to
verify functionality, a circuit schematic for the kit, a bill
of materials (BOM) for the kit, and artwork for each
layer of the PC board.
Features
♦ Analog Gain Control
♦ Up to 44dB Gain-Control Range
♦ 800MHz to 1000MHz Frequency Range
♦ Fully Assembled and Tested
♦ Input and Output Internally Matched to 50Ω Over
Entire Band Of Operation
♦ 50Ω SMA Inputs and Outputs for Easy Testing of
All MAX2056 Features
Evaluates: MAX2056
MAX2056 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-3552; Rev 0; 2/05
Component List
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
Component Suppliers
PART TEMP RANGE IC PACKAGE
MAX2056EVKIT -40°C to +85°C
36 Thin QFN-EP*
*EP = Exposed paddle.
DESIGNATION
QTY
DESCRIPTION
C1, C3, C5,
C10
4
47pF ±5%, 50V C0G ceramic
capacitors (0402)
Murata GRP1555C1H470J
C2, C4, C6,
C8, C9
5
1000pF ±10%, 50V X7R ceramic
capacitors (0402)
Murata GRP155R71H102K
C7 1
3.9pF ±0.1pF, 50V C0G ceramic
capacitor (0402)
Murata GRP1555C1H3R9B
C11, C12, C16
0 Not installed (0603)
C13, C14, C15
3
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
C17 0 Not installed (0402)
J1–J5 5
PC board edge-mount SMA RF
connectors (flat-tab launch)
Johnson 142-0741-856
R1 1 1.2kΩ ±1% resistor (0402)
SUPPLIER PHONE WEBSITE
Johnson 507-833-8822 www.johnsoncomponents.com
Murata 770-436-1300 www.murata.com
DESIGNATION QTY DESCRIPTION
R2 1 3.92kΩ ±1% resistor (0402)
R3, R4 2 0Ω resistors (0402)
Large test point for 0.062in PC
TP1 1
board (red)
Mouser 151-107 or equivalent
TP2 1
U1 1
Large test point for 0.062in PC
board (black)
Mouser 151-103 or equivalent
Analog VGA IC
(36-pin, 6mm x 6mm thin QFN-EP)
Maxim MAX2056ETX
NOTE: U1 HAS AN EXPOSED
PADDLE CONDUCTOR THAT
REQUIRES IT TO BE SOLDER
ATTACHED TO A GROUNDED PAD
ON THE PC BOARD TO ENSURE A
PROPER ELECTRICAL/THERMAL
DESIGN.
Evaluates: MAX2056
Quick Start
The MAX2056 EV kit is fully assembled and factory tested.
Follow the instructions in the Connections and Setup
section for proper device evaluation.
Test Equipment
• One DC power supply capable of supplying 5V
and 0.3A
• One DC power supply that can be adjusted from 1V
to 4.5V for gain control
• Two digital multimeters (DMM) to monitor V
CC
and
ICC, if desired
• HP 8648 (or equivalent) signal source
• HP 8561E (or equivalent) spectrum analyzer
• HP 8753D (or equivalent) network analyzer to measure return loss and gain over frequency (optional)
Connections and Setup
This section provides a step-by-step guide to testing
the basic functionality of the EV kit. To prevent damaging the device, do not turn on DC power or RF signal
generators until all connections are made. Do not
apply VCNTL without VCCpresent (see the VCNTL
section).
Testing the Supply Current
1) Connect 50Ω terminations to J1 and J2.
2) With its output disabled, set the voltage on one of
the DC supplies to +5.0V (through a low internal
resistance ammeter, if desired) and connect to the
+5.0V (TP1) and GND (TP2) terminals on the EV kit.
If the power supply has a current-limiting feature,
set the current limit to 200mA.
3) With its output disabled, set the voltage on the second DC supply to 1V and connect to the gain-control
connector VCNTL (J3) on the EV kit. This configures
the device for its maximum gain setting. If the power
supply has a current-limiting feature, set the current
limit to 1mA.
4) Enable the VCCsupply, then enable the gain-control
supply; the VCCsupply current should read approximately 136mA.
Testing the Power Gain
1) With its supply output disabled, set the voltage on one
of the DC supplies to +5.0V (through a low internal
resistance ammeter, if desired) and connect to the
+5.0V (TP1) and GND (TP2) terminals on the EV kit. If
available, set the current limit to 200mA.
2) With its supply output disabled, set the voltage on the
other DC supply to 1V and connect to the gain-control
connector VCNTL (J3) on the EV kit. If available, set
the current limit to 1mA.
3) With the generator output disabled, connect the RF
signal generator to J1. Set the generator to a
900MHz output frequency, and set the power level
to -13dBm.
4) Connect the spectrum analyzer to J2. Set the spectrum analyzer to a center frequency of 900MHz and
a total span of 1MHz. Set the reference level on the
spectrum analyzer to +10dBm.
5) Enable the V
CC
supply. Next, enable the gain-control
supply. Finally, enable the RF generator’s output. A
900MHz signal with a magnitude of approximately
3dBm should be displayed on the spectrum analyzer.
Be sure to account for external cable losses.
6) Vary the gain-control supply voltage between +1.0V
and +4.5V. The output power should vary by
approximately 22dB.
7) Gain can also be determined with a network analyzer.
This has the advantage of displaying gain over a
swept frequency band, in addition to displaying
input and output return loss. Refer to the network
analyzer manufacturer’s user manual for setup
details (optional).
Detailed Description
Figure 1 shows the schematic for the MAX2056 EV kit.
C1, C3, C5, and C7 are DC-blocking capacitors for the
IN_A, IN, AMP_IN, and OUT pins. To reduce the possibility of noise pickup from the power supply, capacitors
C2, C4, C6, C8, C9, C10, C13, C14, and C15 are used
to decouple VCC. Resistors R1 and R2 are used to bias
the amplifier’s first and second stages, respectively.
Current-Setting Resistors
The MAX2056 amplifier section is a two-stage design
whose input stage current is set by the external resistor
R1, while the output stage current is set by resistor R2.
These resistors were optimized at the factory to produce the highest OIP3 for a given current. The current
of the device can be reduced by increasing these
resistor values (see the Modifying the EV Kit section),
but linearity performance degrades.
MAX2056 Evaluation Kit
2 _______________________________________________________________________________________
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